A helical backup element includes a tubular body of material and a helical opening in the tubular body.
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1. A backup device comprising:
a helical backup element including
a tubular body of material having at least one frustoconical end surface configured to assist in causing radial outward movement of the element in response to axial compression thereagainst; and
a helical opening in the tubular body.
11. A sealing element backup system comprising: a helical backup element including
a tubular body of material having at least one frustoconical end surface configured to assist in causing radial outward movement of the tubular body in response to axial compression thereagainst;
a helical opening in the tubular body; and
at least one frustoconical surface in operable communication with the tubular body.
2. The element as claimed in
3. The element as claimed in
4. The element as claimed in
5. The element as claimed in
9. The element as claimed in
10. The element as claimed in
12. The system as claimed in
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The present application claims priority to United States Provisional Patent Application Ser. No. 60/942,084, filed Jun. 5, 2007, the entire contents of which are specifically incorporated herein by reference.
Utilization of Packers and other angular sealing type devices to seal annular spaces between tubular members have been employed in various industries for a relatively long period of time. One industry utilizing such seals is the hydrocarbon recovery industry, which generally utilizes many annular sealing devices (packers, etc.) for various purposes in the wellbore. While available, annular sealing devices work well for their intended purpose. A common consideration for the use of and selection of a type of annular seal is the risk of extrusion of the sealing element axially due to pressure differential across the seal. For this reason, the art has developed a number of different types of backup rings whose purpose is to reduce the radial dimension of the annulus between two tubular components so that extrusion gap is narrowed thereby making extrusion less likely.
Prior art backup elements generally rely upon conical components that are splayed open to a large diameter when compressed. This requires at least a stretchable, if not resilient property, to be retained in the material used as the backup. While such resilient properties enable these devices to function, they also are the Achilles' heel of the device because they do not provide sufficient rigidity to prevent extrusion of the primary seal in some conditions.
Other prior art elements utilize metal backup rings but they tend to be more complex requiring multiple petals or other interactive structures allowing them to attain a larger diametrical dimension upon axial compression. Such metal elements are more costly and have a relatively narrow adaptiveness and unexpected conditions at the point of use.
As the industry will continue to require backup rings for the foreseeable future to prevent primary element extrusion, the art will well receive an improved backup element.
A helical backup element includes a tubular body of material and a helical opening in the tubular body.
A sealing element backup system includes a tubular body of material; a helical opening in the tubular body; and at least one frustoconical surface in operable communication with the tubular body.
Referring now to the drawings wherein like elements are numbered alike in the several Figures:
Referring to
The element 10, in one embodiment, comprises a composite material and binder. The material requires properties of structural integrity with relatively high tensile and shear resistance. The binder is to be selected to have sufficient cohesive strength and to be resistant to temperature, pressure and caustic fluids to stay intact while in the downhole environment. Examples of composites that meet the foregoing requirements are epoxy, phenolic, vinylester or other binders with carbon, aramid, glass, ceramic or other reinforcement and combinations including at least one of the foregoing. Choice of binder and reinforcement is tailored to the target application: temperature, pressure and chemical nature of the use-environment. It is to be appreciated that this is not an exhaustive list.
In operation, the element 10 appears as it does in
While an embodiment of the invention has been described with respect to composite materials, it is also important to note that appropriate single materials, such as metallic, polymer, or even felted-fiber materials could be used to fabricate the backup element 10. Providing that the material is possessed of strength characteristics facilitating the helically induced radial expansion based upon axially applied load, the material 10 will work, as does the composite element discussed above.
While preferred embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
Guest, Randall V., Samuelson, Marc N., Kroll, Dennis E., Vinson, Justin P.
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May 23 2008 | GUEST, RANDALL V | Baker Hughes Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 021093 | /0092 | |
May 23 2008 | SAMUELSON, MARC N | Baker Hughes Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 021093 | /0092 | |
May 27 2008 | VINSON, JUSTIN P | Baker Hughes Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 021093 | /0092 | |
May 27 2008 | KROLL, DENNIS E | Baker Hughes Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 021093 | /0092 | |
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